CNDB-13925: Prefer not analyzed indexes for contains queries (#1718) #1853
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Prefer not-analyzed indexes over analyzed indexes for contains queries, so they have a deterministic behaviour.
Also, emit a client warning when a not-analyzed index is selected over an analyzed index.
Otherwise, different points in the codebase will make different, pseudo-random decisions about what index should be used for a certain contains expression, leading to erratic behaviour.